Process for manufacturing synthetic isoprene.



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GGTFET FEJTEEURTGH TJEEJ GROSS, OF UHRTSTIANIA, NURWAY.

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The present invention has for its object a process for manufacturing synthetic isoprene of turpentine oil, giving a large yield oil isoprene relatively to the amount of raw material used.

The invention consists therein, that the vapors of turpentine oil at a temperature below 700 C. is brought into contact with one or more metal oxids, metal oxid hydrates or metal oxychlorids or with one or more basic metal salts.

The process can be carried out in difierent ways; according to the circumstances and the consistence oi the oxid as used the vapors of the turpentine oil can be brought to pass through or'past the said oxid. After treating the vaors in this way they are con densed by eingrapidly cooled, eventually by means of a treezing mixture.

As catalyst a metal oxid is most suitable, and it has proved that a very ood efiect is obtained with copper oxid in a nely divided state. The said catalyst suitably is introduced in a pipe or in a system of pipes, through which the vapors of the turpentine oil are brought to pass. The catalytic-oilect oi the copper oxid will begin at a temperature of 264-267 C. but the temperature is held higher, although not so hi 'h that the onid is reduced into metal. it has proved, that the catalyst will act in a very edective manner, ifit is brought into a plastic state. Such a plastic mass can be obtained by mingling a waterfree oxid with a saturated solution Ofyit chlorid of the same or another metal, whereby a plastic or dough-like mass is obtained. which is suitably pressed in a term and dried in the free air or by heat.

In case copper oxi'd'be us'e'dyit is mingled duringstirrmg with a saturated solution of specification of Letters Patent.

Patented dune ll, reia.

Application filed June 12, 19-13. Serial Ito. 773,248.

copper chlorid. This plastic mass can out course be placed into a pipe of iron, copper or any other metal. But the best result is gained by forming of said mass a pipe or a receiver of any other shape and by inclosing said pipe or receiver in a closed metallic shell. t is also possible to provide closed metal pipes or other receivers on the inside with a. layer of the plastic mass. The said layer ought to be about 2 centimeters thick. its the mass is porous and can be made more porous by suitable additions the vapors can pass through the whole layer and in this way a contact surface will be obtained, Which is very great and far greater than that which is obtained by using metal oxid in pieces. Besides the edective contact surface is maintained unchanged during the whole process. It has proved that by using such catalysts as described a yield of isoprene of up to 40% can be obtained. The vapors can be made to pass through the pipes or receivers with or without using pressure.

Having now described my invention what I claim and desire to protect by Letters Patent is:

1. The process of manufacturing isoprene from turpentine oil which consists in bringing vapors of said oil into contact with a meta lic oxid at a temperature between 264 and 700 C.

2. The process of manufacturin isoprene from turpentine oil which cons sts in bringing vapors of said oil into contact with a mixture of metallic oxid and a metallic chlorid at a temperature between 264 and 700 U.

3.- The process of manufacturing isoprene from turpentine oil which consists in bringing vapors of said oil into contact with coper oxid at a temperature between 264 and 4. The process of manufacturing isoprene from turpentine oil which consists in bringing the vapors of said oil into contact with a mixture of copper oxid and'copper chlorid of a temperature between 264 and 700 C. Tn testimony whereof I have afiixed my signature in presence of two witnesses.

IGOURT KARL FRIEDRICH LEO GROSS.

.Witnesses: Ml. E. GUI-BORENSEN,

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